Question
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?
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3s 4s 3p 3d
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4s 3s 3p 3d
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3s 3p 3d 4s
-
3s 3p 4s 3d
Solution
C.
3s 3p 3d 4s
According to Aufbau rule
3s < 3p < 3d< 4s
